State Flexibility.--Notwithstanding any other provision of this section, an employer shall not be required to pay an employee a wage that is greater than the minimum wage provided for by the law of the State in which the employee is employed...
Bob Geiger picked up on this
Here's the list of Senators that voted in favor of this amendment. Perhaps the most notable is preidential candidate John McCain. Just remember this the next time someone tells you how great McCain is.